如何在媒体播放器中播放音频文件

1 回答

• 0

  public class MainActivity extends AppCompatActivity {
  private static final int SOUND_LOAD_REQUEST = 1;
  ImageView choose;
  private MediaPlayer mMediaPlayer;
  private String[] mMusicList;
  private ImageView b1, b2, b3, b4;
  private ImageView iv;
  private double startTime = 0;
  private double finalTime = 0;
  private Handler myHandler = new Handler();
  ;
  private int forwardTime = 5000;
  private int backwardTime = 5000;
  private SeekBar seekbar;
  private TextView tx1, tx2, tx3;
  public static int oneTimeOnly = 0;
  Uri uri;
  String path;
  String ringtoneTitle;
  Uri soundUri;
  
  
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
  
      choose = (ImageView) findViewById(R.id.choose);
  
      b1 = (ImageView) findViewById(R.id.button);
      b2 = (ImageView) findViewById(R.id.button2);
      b3 = (ImageView) findViewById(R.id.button3);
      b4 = (ImageView) findViewById(R.id.button4);
      iv = (ImageView) findViewById(R.id.imageView);
  
      tx1 = (TextView) findViewById(R.id.textView2);
      tx2 = (TextView) findViewById(R.id.textView3);
      tx3 = (TextView) findViewById(R.id.textView4);
      mMediaPlayer = new MediaPlayer();
  
  
      seekbar = (SeekBar) findViewById(R.id.seekBar);
      seekbar.setClickable(false);
      b2.setEnabled(false);
  
      b2.setOnClickListener(new View.OnClickListener() {
          @Override
          public void onClick(View v) {
              Toast.makeText(getApplicationContext(), "Pausing sound", Toast.LENGTH_SHORT).show();
              mMediaPlayer.pause();
              b2.setEnabled(false);
              b3.setEnabled(true);
          }
      });
  
      b1.setOnClickListener(new View.OnClickListener() {
          @Override
          public void onClick(View v) {
              int temp = (int) startTime;
  
              if ((temp + forwardTime) <= finalTime) {
                  startTime = startTime + forwardTime;
                  mMediaPlayer.seekTo((int) startTime);
                  Toast.makeText(getApplicationContext(), "You have Jumped forward 5 seconds", Toast.LENGTH_SHORT).show();
              } else {
                  Toast.makeText(getApplicationContext(), "Cannot jump forward 5 seconds", Toast.LENGTH_SHORT).show();
              }
          }
      });
  
      b4.setOnClickListener(new View.OnClickListener() {
          @Override
          public void onClick(View v) {
              int temp = (int) startTime;
  
              if ((temp - backwardTime) > 0) {
                  startTime = startTime - backwardTime;
                  mMediaPlayer.seekTo((int) startTime);
                  Toast.makeText(getApplicationContext(), "You have Jumped backward 5 seconds", Toast.LENGTH_SHORT).show();
              } else {
                  Toast.makeText(getApplicationContext(), "Cannot jump backward 5 seconds", Toast.LENGTH_SHORT).show();
              }
          }
      });
  
      choose.setOnClickListener(new View.OnClickListener() {
          @Override
          public void onClick(View view) {
              Intent loadIntent = new Intent();
              loadIntent.setAction(Intent.ACTION_GET_CONTENT);
              loadIntent.setType("audio/*");
              startActivityForResult(createChooser(loadIntent, "Select Audio"), SOUND_LOAD_REQUEST);
  
          }
      });
  
  
  }
  
  
  private Runnable UpdateSongTime = new Runnable() {
      public void run() {
          startTime = mMediaPlayer.getCurrentPosition();
          tx1.setText(String.format("%d min, %d sec",
  
                  TimeUnit.MILLISECONDS.toMinutes((long) startTime),
                  TimeUnit.MILLISECONDS.toSeconds((long) startTime) -
                          TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.
                                  toMinutes((long) startTime)))
          );
          seekbar.setProgress((int) startTime);
          myHandler.postDelayed(this, 100);
      }
  };
  
  
  
  
  
  
  protected void onActivityResult(int requestCode, int resultCode, Intent data) {
      if (requestCode == SOUND_LOAD_REQUEST)
          if (resultCode == RESULT_OK) {
  
               soundUri = data.getData();
  
              try {
                  mMediaPlayer.setDataSource(this, soundUri);
              } catch (IOException e) {
                  e.printStackTrace();
              }
              mMediaPlayer.prepareAsync();
  
              b3.setOnClickListener(new View.OnClickListener() {
                  @Override
                  public void onClick(View v) {
  
                      mMediaPlayer.start();
                      Toast.makeText(getApplicationContext(), "Playing sound", Toast.LENGTH_SHORT).show();
  
                      finalTime = mMediaPlayer.getDuration();
                      startTime = mMediaPlayer.getCurrentPosition();
  
                      if (oneTimeOnly == 0) {
                          seekbar.setMax((int) finalTime);
                          oneTimeOnly = 1;
                      }
                      tx2.setText(String.format("%d min, %d sec",
                              TimeUnit.MILLISECONDS.toMinutes((long) finalTime),
                              TimeUnit.MILLISECONDS.toSeconds((long) finalTime) -
                                      TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes((long) finalTime)))
                      );
  
                      tx1.setText(String.format("%d min, %d sec",
                              TimeUnit.MILLISECONDS.toMinutes((long) startTime),
                              TimeUnit.MILLISECONDS.toSeconds((long) startTime) -
                                      TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes((long) startTime)))
                      );
  
                      seekbar.setProgress((int) startTime);
                      myHandler.postDelayed(UpdateSongTime, 100);
                      b2.setEnabled(true);
                      b3.setEnabled(false);
                  }
              });
          }
  }
  
   }
  

  这段代码终于有效了

  回复于 2024-05-05T10:29:26+08:00